This article will show how to convert electrical resistance measurement units from microohms (µΩ) to milliohms (mΩ). We will cover essential definitions, provide examples, share relevant formulas, and present tables, along with answers to common questions.
Definitions of Ohm, Microohm, and Milliohm
Let’s get started by understanding the key definitions of Ohm (Ω), Microohm (µΩ), and Milliohm (mΩ). Understanding these terms will enable you to perform conversions with confidence.
What is Ohm?
The ohm (Ω) is the SI derived unit of electrical resistance. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt is applied across those points, producing a current of one ampere in the conductor, assuming no additional electromotive force is present.[1]
According to SI prefixes[2], which are based on powers of 10, an ohm (1 Ω) is equivalent to one million microohms (106 µΩ or 1,000,000 µΩ).
What is Microohm?
A microohm (µΩ) is a unit of electrical resistance in the SI system equal to one millionth (1/1,000,000) of an ohm (10-6 Ω).
It is vital for detecting hidden flaws in high-stakes systems like EV batteries, power grids, and industrial motors. Even a fraction of extra resistance here can cause overheating, energy waste, or catastrophic failures.
What is Milliohm?
A milliohm (mΩ) is a unit of electrical resistance in the SI system equal to one thousandth (1/1,000) of an ohm (10-3 Ω).
It is commonly used in fields such as power distribution, precision electronic testing, and industrial motor evaluation. Accurately measuring very low resistance values is essential for determining the efficiency and reliability of these systems.
µΩ to mΩ formula
Let’s take a closer look at the conversion formula so you can carry out these conversions independently, whether using a calculator or doing it manually with pencil and paper.
The micro- prefix in the International System of Units (SI) corresponds to a multiplier of 10-6 (0.000001) while the milli- prefix represents 10-3 (0.001).
To convert microohms (µΩ) to milliohms (mΩ), divide the resistance value in microohms by 103 (1,000), since 1 milliohm equals 1,000 microohms.
R(mΩ) = R(µΩ) ÷ 103 = R(µΩ) ÷ 1,000
Or remember the µΩ-to-mΩ conversion factor: 1 µΩ = 10-3 = 0.001 mΩ
µΩ to mΩ conversion table
The conversion table below provides a handy reference for converting electrical resistance measurement units from microohms (µΩ) to milliohms (mΩ). It covers a range from 0.1 µΩ to 1,000 µΩ, allowing for easy and quick conversions between these units of measurement.
| Microohms (µΩ) | Milliohms (mΩ) |
|---|---|
| 0.1 µΩ | 0.0001 mΩ |
| 0.5 µΩ | 0.0005 mΩ |
| 1 µΩ | 0.001 mΩ |
| 2 µΩ | 0.002 mΩ |
| 4 µΩ | 0.004 mΩ |
| 5 µΩ | 0.005 mΩ |
| 10 µΩ | 0.01 mΩ |
| 20 µΩ | 0.02 mΩ |
| 30 µΩ | 0.03 mΩ |
| 40 µΩ | 0.04 mΩ |
| 50 µΩ | 0.05 mΩ |
| 60 µΩ | 0.06 mΩ |
| 70 µΩ | 0.07 mΩ |
| 80 µΩ | 0.08 mΩ |
| 90 µΩ | 0.09 mΩ |
| 100 µΩ | 0.1 mΩ |
| 200 µΩ | 0.2 mΩ |
| 500 µΩ | 0.5 mΩ |
| 800 µΩ | 0.8 mΩ |
| 1,000 µΩ | 1 mΩ |
Examples
Now, let's look at an example that illustrates the calculations required to convert from microohms to milliohms (µΩ to mΩ).
Example: Electric Vehicle Power Connector Resistance Testing
Electric vehicle (EV) power connectors must have minimal resistance to maximize energy efficiency and prevent overheating. Converting resistance values to milliohms ensures compliance with industry standards.
If an EV connector has a resistance of 9,100 µΩ, what is its value in milliohms?
Solution
Since 1 milliohm (mΩ) = 1,000 microohms (µΩ), we can convert 9,100 µΩ to milliohms by using the following formula:
Therefore, the 9,100 µΩ electrical resistance is equivalent to 9.1 mΩ.
To solve the problem with our calculator, follow the steps below:
- Enter the value in microohms: For this example, enter
9,100into the From box. - View the result: The converter instantly calculates and displays the equivalent value in milliohms:
9.1 mΩ.
FAQs
Is 1 microohm or 1 milliohm larger?
A milliohm (mΩ) is a thousand times bigger than a microohm (µΩ). Here are the relationships between the units:
1 mΩ = 103 = 1,000 µΩ1 µΩ = 10-3 = 1 ÷ 1,000 = 0.001 mΩ
How to convert from microohms to milliohms?
To convert electrical resistance from microohms (µΩ) to milliohms (mΩ), follow these simple steps:
- Step 1: Write down the electrical resistance value in microohms (µΩ).
- Step 2: Divide it by a thousand (
1,000). - Step 3: The result is the value of the electrical resistance in milliohms (mΩ).
Why do I need to convert microohms to milliohms?
Converting microohms to milliohms is useful when working with very low resistance values. Since milliohms provide a larger unit, they reduce small decimal numbers, making calculations and comparisons easier.
This is especially important in applications like PCB trace analysis, semiconductor testing, and battery terminal evaluations, where precise resistance measurements are needed.
For example, if a resistance is measured at 5,000 µΩ, converting it to milliohms (5,000 ÷ 1,000) gives 5 mΩ. This conversion simplifies documentation and ensures consistency in engineering calculations.
You now know how to convert electrical resistance from microohms (µΩ) to milliohms (mΩ). You can quickly use our calculator to convert between the electric resistance measurement units to save time for future calculations.
